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excited state: state in which an atom or molecule picks up outside energy, causing an electron to move into a higher-energy orbital.
1 electron a particle in the space outside the nucleus of an atom that carries one unit of negative electric charge. 2  electron microscope a magnifying tool that uses electron beams instead of light to see small objects. electron a particle in the space outside the nucleus of an atom that carries one unit of negative electric charge. 2  electron microscope a magnifying tool that uses electron beams instead of light to see small objects.